Is 359 hp considered peak hp? If so, for this speed to be reached, you would have to assume this peak hp would be reached at the same time the theoretical top speed would be reached. So ignoring gear ratios might be erronous. In other words, is there a gear where this speed would be reached at approximately the same time that this peak hp would be reached? The hp curve would have to top out at the same time the speed curve does. Probably nitpicking as I assume this is just a theoretical excercise anyway.